I'm the co-author of the released libraries Boost.Ratio and Boost.Chrono. I'm the author of some other Boost proposals as Boost.Conversion, Boost.Stopwatches. Other libraries that I have not yet proposed to Boost, but that could be proposed soon are Boost.Opaque, Boost.Enums, an extension to Boost.Endian, Boost.Bitfields, Boost.Async, Boost.Synchro, and Boost.Interthreads.